beaugunderson/ip-address

IPv6 inaccuracies

Opened this issue · 2 comments

wzrdtales commented

There are three details that are not correct:

  1. The comment of lastAddress for an IPv6 address says, this usually is a broadcast address. IPv6 does not have a broadcast, the doc should either reflect that or remove this comment to avoid ill informing users.

  2. endAddressExclusive it will not respect the 128 anycast addresses at the top

  3. endAddressExclusive it claims the broadcast address exists, correct is also the last address is valid.

beaugunderson commented

thanks for reporting @wzrdtales, for 2. and 3. can you be more explicit so I understand what needs to change?

wzrdtales commented

Sure, according to the official Standard (https://www.rfc-editor.org/rfc/rfc2526.html), IPv6 does not have a broadcast address. The library says the last address is invalid, this is not true it is a valid address, but it is also a reserved anycast address.

Further, the last 128 addresses in an ipv6 subnet, are reserved anycast addresses, they can't be utilized as unicast and therefor should not be returned in endAddressExclusive